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Bottoms Dam
Langley, near Macclesfield, Chesire, UK
associated engineer
John Frederick La Trobe Bateman
S. C. Trapp
date  circa 1850
UK era  Victorian  |  category  Dam/Reservoir  |  reference  SJ944716
ICE reference number  HEW 1153
Bottoms Dam and its reservoir were built in the Bollin Valley under the terms of the Macclesfield Borough Waterworks Act 1849, together with a nearby subsidiary dam. Slightly higher in the valley is the adjoining Teggs Nose Reservoir, built in 1871.
Bottoms Dam is 181m long and 11.6m high. The subsidiary dam is 114m long. Teggs Nose Reservoir is similar in size to Bottoms Reservoir.
Bottoms Dam is an earth dam with a shallow impervious puddle clay layer beneath it (the cutoff) to stop seepage through the foundations. The core of the dam is also puddle clay, and loamy sand was used for the fill (sloping layer either side of the core).
The original outlet arrangement consisted of two 30mm flanged cast iron pipelines. Each line was 2.75m long and they were laid 500mm apart, directly under the embankment at roughly original ground level. The sluice valves are located in a valve house at the toe of the embankment, i.e., where it meets the natural ground. Where the pipelines crossed the clay in the cutoff trench, they were supported on a masonry pier, 1.2m long and 710mm wide.
During repairs in 1929-30, both pipelines were found to be broken. They were replaced with a new 46mm pipeline inside a 1.8m diameter culvert.
Engineer (1930 repairs): Herbert Lapworth
Research: PD
"Repairs to an Old Earth Dam at Macclesfield" by G.W. Cove, Trans. I.W.E., Vol. 36, 1931, pp282-297

Bottoms Dam